<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
	<script>
		arr = [54,543,5,45,7878];

		// arr.push(89);
		// arr.unshift(999);
		// arr.pop();
		// arr.shift();
		// 
		console.log(arr);

		res = arr.join(",");

		// arr.splice(2,0,89,90);
		// res = arr.slice(2,4);

		// console.log(arr);
		console.log(res);
		// console.log(arr.length);


		arr1=[4354,4,45,45,5]
		arr2 = [4545,45,4,5,45,4];
		
		res = arr1.concat(arr2);

		console.log(res);

	</script>
</head>
<body>
	
</body>
</html>